Journal of the Mass Spectrometry Society of Japan
Online ISSN : 1880-4225
Print ISSN : 1340-8097
ISSN-L : 1340-8097
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Volume 46, Issue 2
Displaying 1-4 of 4 articles from this issue
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REVIEW
INTEGRATED PAPER
  • Survey of the Recent Ionization Methods
    Kenzo HIRAOKA
    1998 Volume 46 Issue 2 Pages 123-138
    Published: 1998
    Released on J-STAGE: July 20, 2007
    DOIhttps://doi.org/10.5702/massspec.46.123
    JOURNAL FREE ACCESS
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    Recent ionization methods such as electrospray, ion spray, nanoelectrospray, laser-assisted electrospray/ion spray, explosive vaporization and ionization of liquid beam by infrared laser, massive cluster impact ionization, low-energy ion impact on the van der Waals thin films, and matrix-assisted laser desorption ionization are discussed taking into account the experimental results obtained in the author's laboratory. Some prospects for the new ionization methods are given.
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REGULAR PAPERS
  • A Terminal Product Ion in the Fragmentation of Methyl Stearate under Electron Ionization Conditions
    Mitsuo TAKAYAMA
    1998 Volume 46 Issue 2 Pages 139-142
    Published: 1998
    Released on J-STAGE: July 20, 2007
    DOIhttps://doi.org/10.5702/massspec.46.139
    JOURNAL FREE ACCESS
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    Fragmentations of the molecular and fragment ions of methyl stearate, under 70 eV electron ionization (EI) conditions, have been studied by using collision-induced dissociation (CID) and metastable ion decay (MID) techniques. The CID and MID spectra of aged molecular ions Mi+· quite differed from the EI mass spectrum resulted from the in-source fragmentation of initially produced molecular ions M0+· in pattern. The CID spectra of the Mi+· ion mainly showed peaks of m/z 255, 199, and 143 ions, while CID spectra of these 56-Da periodical fragments showed only a preferential product ion at m/z 101. CID spectra of other fragment ions also indicated that the m/z 101 ion is a terminal product. The structure of the ion at m/z 101 has been discussed.
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  • A New Versatile Matrix for Fast Atom Bombardment Mass Spectrometry
    Mitsuo TAKAYAMA, Hiromi KATAOKA, Toyoshi KATAGI, Shizuyo HORIYAMA, Mas ...
    1998 Volume 46 Issue 2 Pages 143-149
    Published: 1998
    Released on J-STAGE: July 20, 2007
    DOIhttps://doi.org/10.5702/massspec.46.143
    JOURNAL FREE ACCESS
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    A new liquid matrix referred to as DTT/NBA, a 1 : 1 (v/v) mixture of dithiothreitol (DTT) and m-nitrobenzyl alcohol (NBA), has been prepared on the basis of a criterion for the choice of matrix in fast atom bombardment mass spectrometry. The capability of DTT/NBA was examined by comparing with those of conventional matrices from the points of durability and chemical inertness. The durability of DTT/NBA was more than ten minutes under the irradiation of fast atom beam, and the mass spectral patterns obtained little varied over the irradiation time. The DTT/NBA matrix inhibited from a degradation reaction of O-acyl oximes, while conventional matrices used here brought about a reductive degradation.
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